Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Marcin Walczak, DN

Naprapath in Barrington, IL · enumerated 2015.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1184017170

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Registry record

Entity type Individual (Type 1)

Name Dr. Marcin Walczak

Credential DN

Sex Male

Practice address 111 Lions Dr Ste 207, Barrington, IL, 60010

Phone (773) 621-2255

Enumeration date Mar 15, 2015

Last updated in NPPES Jul 24, 2025

Taxonomy & licenses

172P00000X Naprapath Other Service Providers · License 181000391 (IL) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Marcin Walczak?

Marcin Walczak is registered in NPPES with the primary taxonomy of Naprapath. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-07-24.